Commands/Tools to detect Enabled USB Ports

Hi,

My PC runs windows XP SP3.

Since there are many USB ports in a PC and USB ports are used by various USB devices like Keyboard / Mouse, USB memory sticks, etc....

I would like to know if there are any windows DOS commands / Portable Tool to run and find out...

1. How many USB ports are present in a PC.
2. Among these ports how many ports are Enabled and how many are Disabled.
3. What are all the USB Devices connected to the PC.

Please help me in this regard...

Thanks and Regards
Yoda